I'm new to the RC world. I picked up a TMAXX (used) a few weeks ago. It has the ez start electric starter on it. When I try starting it the electric motor spins and sometimes it tries to catch and sometimes the motor just spins. I can charge my starter and it will deplete the charge before the engine wants to catch. Most of the time it doesn't start. What do I need to look at or what could be wrong. I notice when I release the starter button the engine wants to try to catch. It doesn't do it on start up only shutting down. Any advise would be great.